Herbed Tuna Salad

Ingredients

• 1 can (6 ounces) light water-packed tuna, drained and flaked
• 2 tablespoons finely chopped red onion
• 1 teaspoon minced fresh parsley
• 1-1/2 teaspoons dill weed
• 1/8 teaspoon garlic salt
• 1/8 teaspoon dried thyme
• 1/8 teaspoon pepper
• Pinch cayenne pepper
• 2 tablespoons fat-free mayonnaise
• 1 tablespoon reduced-fat sour cream
• 3 cups Boston lettuce leaves
• 6 grape tomatoes, sliced
• Optional: Sliced cucumber and fresh dill